Submitted by Jos? Henrique Henrique (jose.neves@ufvjm.edu.br) on 2018-11-22T16:49:47Z No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) ana_claudia_silveira_alexandre.pdf: 1522170 bytes, checksum: ecd371ab3f6777103dd99573de2bf35a (MD5) / Made available in DSpace on 2018-11-22T16:49:47Z (GMT). No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) ana_claudia_silveira_alexandre.pdf: 1522170 bytes, checksum: ecd371ab3f6777103dd99573de2bf35a (MD5) Previous issue date: 2018 / Funda??o de Amparo ? Pesquisa do estado de Minas Gerais (FAPEMIG) / A melancia (Citrullus lanatus) ? um fruto refrescante que apresenta versatilidade de consumo e consider?vel potencial nutricional; entretanto, ? respons?vel por uma grande gera??o de res?duos, sendo o mesocarpo (entrecasca), o principal destes. Este res?duo agr?cola subutilizado ? uma boa alternativa para aproveitamento e desenvolvimentos de novos produtos. O presente estudo relata a possibilidade de agrega??o de valor ao mesocarpo de melancia por meio do desenvolvimento de picles acidificados e fermentados. A efici?ncia do emprego de culturas starters, cultura aut?ctone isolada e cultura de Lactobacillus acidophilus foram avaliados e comparados em rela??o ? fermenta??o natural do mesocarpo de melancia. As fermenta??es foram acompanhadas por meio de an?lises f?sico-qu?micas e microbiol?gicas, e os produtos foram caracterizados quanto ? composi??o centesimal, f?sico-qu?mica, qualidade microbiol?gica e sensorial. Inferiu-se que a exist?ncia de bact?rias l?ticas durante os processos fermentativos do mesocarpo de melancia afetou a comunidade microbiana presente, resultando no consumo de carboidratos, produ??o de ?cidos org?nicos e acidifica??o do meio fermentativo. Nas fermenta??es adicionadas de culturas starters, foram alcan?ados menores valores de pH ao final dos processos fermentativos, sendo atingidos pH 3,52 (cultura starter aut?ctone isolada) e pH 3,68 (cultura starter L. acidophilus). A fermenta??o do mesocarpo de melancia resultou em produtos com maior valor nutricional, mais seguros e est?veis. Determinou-se que os picles desenvolvidos foram seguros do ponto de vista microbiol?gico, al?m de apresentarem maior potencial bioativo que o mesocarpo in natura. Os melhores resultados sensoriais foram encontrados para os picles n?o fermentados. / Disserta??o (Mestrado) ? Programa de P?s-gradua??o em Ci?ncia e Tecnologia de Alimentos, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2018. / The watermelon (Citrullus lanatus) is a refreshing fruit that presents versatility for consumption and considerable nutritional potential; however, it is responsible for a large generation of residues, the mesocarp (inner rind) being the principal residue. This underutilized agricultural residue is a good alternative for the use and development of new products. The present study reports the possibility of increasing the value to the watermelon mesocarp through the development of acidified and fermented pickles. The efficiency of the use of starter cultures, isolated autochthonous culture and a culture of Lactobacillus acidophilus were evaluated and compared to the natural fermentation of the watermelon mesocarp. The fermentations were accompanied by physicochemical and microbiological analyses, and the products were characterized with regard to the proximate composition, physicochemical characteristics and the microbiological and sensorial qualities. It was inferred that the existence of lactic bacteria during the fermentative processes of the watermelon mesocarp affected the microbial community present, resulting in the consumption of carbohydrates, production of organic acids and acidification of fermentative media. In the fermentations to which starter cultures were added, lower pH values were reached at the end of the fermentation process, reaching pH 3.52 (native starter culture isolated) and pH 3.68 (L. acidophilus culture starter). The fermentation of the watermelon mesocarp resulted in products with higher nutritional value, being more secure and stable. The pickles developed were found to be safe from a microbiological point of view, in addition to having a greater bioactive potential than the fresh mesocarp. The best sensory results were obtained for the unfermented pickles.